Seriously, you cannot kill as a Christian, because 1. you can't kill
Actually you can. Because the religious hypocrites who scribed the bible realised that they still needed people to fight wars for them they added a clause which said you can kill as a Christian without sin if you're a soldier fighting in a war and in other circumstances even civilians. David is praised for killing Goliath and one of his men credited for killing 800.
Here's some good old hypocrisy from the Bible in Deutronomy 20:10-18 for killing civilians which seems quite familiar with what the Islamic Fundalmentalists say:
- the population of cities outside of the Promised Land, if they surrender, should be made tributaries and left alive (20:10-11)
- those cities outside of the Promised Land that resist should be besieged, and once they fall, the male population should be exterminated, but the women and children should be left alive (20:12-15)
- of those cities that were within the Promised Land, however, the population should be exterminated entirely (20:16-18), specifically "the Hittites, and the Amorites, the Canaanites, and the Perizzites, the Hivites, and the Jebusites" (20:16-18). Deuteronomy 25:19 further commands the extermination of the Amalekites.